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(Np-Model.)

G. W. N. YOST. TYPE WRITING MACHINE.

No. 450,806. PatentedApr. 21,1891.

UNITED STATES PATENT OFFICE.

GEORGE V. N. YOST, OF NEW YORK, N. Y., ASSIGNOR TO THE YOST WRITING MACHINE COMPANY, OF SAME PLACE.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 450,805, dated April 21, 1891.

Application filed March 81, 1888. Serial No. 269,065. (No model.)

To all whom it may concern; coupled to a link or rod 5, provided at its up Be it known that I, GEORGE \V. N. Yos'r, per end with an elongated slot 6, and piva citizen of the United States, and a resident oted at its lower end to the space-key lever 7, of New York city, in the county of New York which is pivoted at a and which is provided 55 and State of New York, have invented cerwith a finger-head 8 above the key-board tain new and useful Improvements in Type frame 9. About midway of the standard at Vriting Machines, of which the following is and the link or slot-ted coupling 5 is pivoted a specification. to the lever a spindle 10, formed with a coni- My present invention relates to an improvecal journal at its upper end to receive aconi- 6o 10 ment in the type-writing machine made the cal bearing in thehub of the universal bar 11, subject-matter of an application filed by mywhich in practice is made circular or like a self and Charles E. Merritt May 16, 1887, No. wheel, as shown in the aforesaid patent, and 238,353, (see Patent No. 400,383, March 26, about midway of the standard 4 and the link 1889,) and has for its main objects, first, to 2 is attached to the lever at one end a spiral 15 provide a simple and efficient space-key conor coiled spring 12, which passes through a nection with the carriage-feed escapement deperforation in the bed-plate and is connected vices, and, secondly, an improved construcat its other end to the upper extremity of a tion and arrangement of universal bar-spring, vertically-arranged screw 13, mounted in a whereby the said spring may be conveniently bracket or housing 14:, and provided at its 2o reached and operated for adjusting its tenlower end with an adjusting-nut 13.

sion; and to these ends my invention consists In addition to being perforated for the pasin the several features of construction and sage of the spring 12, the bed-plate is procombinations or arrangements of parts herevided with holes for the'passage and reciproinafter more fully described, and particularly cation of the link 5 and the spindle 10, all as 2 5 pointed out in the appended claims. clearly illustrated.

Int-he drawingswhichaccompanythisspeot The bracket or housing M is preferably fication and form a part thereof, Figure 1 made of a U shape and secured to the unis a vertical section of a portion of a typeder side of the bed-plate by screws. writing machine embodying my several lIIl- 15 15 represent key-levers pivoted at b at 3o provements, and Fig. 2 isadetail perspective the rear of the machine and provided at their View on an enlarged scale to better show the front ends with finger-keys 16 16. construction and relative arrangement of the 17 17 represent connecting-rods attached at parts to which my improvements have refertheir lower ends to the key-levers 15 15 and once. at their upper ends to the type-bars 18 18,

3 5 In both views the same part will he found which are journaled in hangers 19 19,secured designated by the same letter or numeral of to the top plate of the machine. 1 reference. The connecting-rods 17 are provided with A is the bed or base plate of the machine, lugs or fingers 20, which co-operate with the upon which are secured posts or pillars B B, circular universal barin the mannerdescribed 9o 40 that support the usual typering or top plate 0. in the application above referred to.

D is the paper-carriage, provided with a The operation of the space-key mechanismplaten E and with a yoke F, that travels upon is as follows: On depressing the head 8 the guide-rails G G. To the rear side of the yoke lever 7 is vibrated downwardly from the cenis attached a double feed-rack G2 of the wellter a, and through the medium of the coup- 5 45 known Oaligraph. ling 5 the lever 3 is rocked in the standard 4 H is a rocker-shaft provided with a dog or against the tension of the spring 12, causing pawl I and with an arm J, to the hind end the link 2 to be elevated and the dog I to be of whichis connected alink 2, that is attached vibrated forwardly from one of the racks G2 at its lower end to the rear end of a lever 3, to the other of said racks. Immediately the 50 fulcrumed in a stand or bracket 1, secured to dog is freed from the rearmost rack a spring the bed-plate. The front end of said lever is (not shown) propels said rack forward, as in the Caligraph -before mentioned. On releasing the pressure on the space-key the spring 12 contracts and returns all the parts to their first positions. As the dog I is vibrated rearwardly, the carriage under the in- .fluence of the driving mechanism is moved one tooth to the left.

For the sake of clearness the driving mechanism and some of the essential parts of a type-writing machine are omitted from the drawings; but those skilled in the art will readily understand from the foregoing description and from the other application before referred to the construction and mode of operation of a machine embodying my improvements.

The operation of the machine'during the act of printing is as follows: Pressure being applied to the finger character-key 16, the lever 15 is depressed, the connecting-rod 17 pulled down, and the type-bar elevated to make its impression upon the paper around the under side of the platen. During the descent of the connecting-rod the lug or finger 2O vibrates the circular universal bar, (which acts as a lever,) and through the spindle 10, which is thereby depressed, the lever 3 is rocked, the coiled spring expanded, the link 2 elevated, and the dog I vibrated, as previously explained. On removing the pressure of the finger from the key 16 the resiliency of the spring will operate to return all the parts to their normal positions. During the descent of the frontarm of the lever 3 (when vibrated by the character finger-key 16) the space-key 8 remains stationary by reason of the presence of the slot 6 in the coupling 5,, which prevents the said arm of the lever from reciprocating the said coupling, and hence, also, the lever 7 and the spacekey. This construction provides for an easier key-action and avoids the constant bobbing up and down of the space-key head during the use of the characterkeys in printing, which is a great annoyance.

' I have found in practice that the construction and arrangement of the spring and its appendages in this machine are vastly superior to the same in the machine shown in the joint application above alluded to, for the reason that the thumb-nut may be most conveniently got at and the tension of the spring regulated with the greatest facility. In the other machine the tension-regulator can be reached only by a long tool and after removal of some of the parts of the machine.

Instead of the duplex feed-racks G the carriage may be provided with some other escapement means, as'the Remington, or

that shown in another application by me, and other modifications in construction may be made without departing from the spirit of my invention.

In lieu of key'levers 7 and 15, other connect-ions between the space-key and the character-keys may be employed-such, for instance, as shown in theLetters Patent granted to me March 26, 1889, No. 400,384.

WVhat I claim as new, and desire to secure by Letters Patent, is-

1. In a type-writing machine, the combina tion, with a carriage provided with a feedrack, substantiallyas described, of a vibratory dog or pawl, a vertical connecting-link 2, adapted to actuate the same, a horizontallyarranged lever 3, the rear arm of which is attached to the connecting-link, a vertical rod 5, connected to the front arm of said lever, a space-key, and a longitudinal connection between the space-key and the rod 5, as set forth.

2. In a type-writing machine, the combination, with the carriage provided with a feedrack, substantially as described, of the circular universal bar, the connecting-rods having lugs or fingers, the spindle, the lever 3, the link 2, the vibratory dog, a returning-spring, the slotted coupling 5, the space and character keys, and connections between the latter and the coupling and connecting rods.

3. In a type-writing machine, the combination, with the carriage provided with a feedrack, substantially as described, of the circular universal bar, the connecting-rods having lugs or fingers, means for actuating the same, the spindle, the lever 3, the link 2, the vibratory dog, the coiled spring extending through the bed-plate, the bracket or housing depending below the bed-plate, and means, substantially as described, for adjusting the tension of said spring.

4. In a type-writing machine, the combination, with the paper-carriage provided with a feed-rack, substantially as described, of a circular universal bar, means for actuating the same, a horizontally-arranged lever 3, a spindle connected thereto, a vertical coupling 2, connected to one end of said lever, a vibratory dog, a vertical rod 5, connected to the other end of said lever, a key-lever, and a space-key, as set forth.

Signed at New York city, in the county of New York and State of New York, this 30th day of March, A. D. 1888.

' G. W. N. YOST. Witnesses:

GEORGE FENN, J ACOB FELBEL.

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